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Proceedings Paper

Separating misalignment from misfigure in stigmatic null tests of conic mirrors
Author(s): Qinfang Chen; Zhen Ma; Yingcai Li; Xuyang Li
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Paper Abstract

Null testing of off-axis conic surface at the pair of conjugate foci can add sensitivity resulting from double pass off the test piece. However, the alignment procedure of the test is difficult. The main reason is that the return wavefront from off-axis aspheric surface is not rotationally symmetric so that the observer cannot tell if the wavefront asymmetries are due to surface or misalignment errors. In this paper, we analyze the effect of misalignments on test results with the optical path method, and derive an equation for misalignment-induced aberrations. Next we present an optimum method for the removal of alignment errors. As an example the method is applied to the alignment of an off-axis mirror. After several alignments, a misaligned test system giving 0.093λ rms wavefront error can be adjusted to 0.024λ, at 0.6328 microns.

Paper Details

Date Published: 9 November 2010
PDF: 6 pages
Proc. SPIE 7849, Optical Design and Testing IV, 784909 (9 November 2010); doi: 10.1117/12.869784
Show Author Affiliations
Qinfang Chen, Xi'an Institute of Optics and Precision Mechanics (China)
Graduate Univ. of Chinese Academy of Sciences (China)
Zhen Ma, Xi'an Institute of Optics and Precision Mechanics (China)
Graduate Univ. of Chinese Academy of Sciences (China)
Yingcai Li, Xi'an Institute of Optics and Precision Mechanics (China)
Xuyang Li, Xi'an Institute of Optics and Precision Mechanics (China)
Graduate Univ. of Chinese Academy of Sciences (China)


Published in SPIE Proceedings Vol. 7849:
Optical Design and Testing IV
Yongtian Wang; Julie Bentley; Chunlei Du; Kimio Tatsuno; Hendrik P. Urbach, Editor(s)

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